/* Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd. All rights reserved. Copyright (C) 2007, 2008, Gabriel Dos Reis All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. - Neither the name of The Numerical ALgorithms Group Ltd. nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "axiom-c-macros.h" #include #include #include #include #include #include #include #ifdef __WIN32__ # include #endif #include "cfuns-c.H1" /* Most versions of Windows don't have the POSIX functions getuid(), geteuid(), getgid(), and getegid(). The following definitions are approximations, to patch for the deficiencies of Windows POSIX interface. */ #if !HAVE_DECL_GETUID # define getuid() 0 #endif #if !HAVE_DECL_GETGID # define getgid() 0 #endif #if !HAVE_DECL_GETEUID # define geteuid() getuid() #endif #if !HAVE_DECL_GETEGID # define getegid() getgid() #endif int addtopath(char *dir) { char *path, *newpath; path = getenv("PATH"); if (path == NULL) return -1; newpath = (char *) malloc(1 + strlen(path) + strlen(dir) + strlen("PATH=:")); if (newpath == NULL) return -1; sprintf(newpath, "PATH=%s:%s", path, dir); return putenv(newpath); } /* * Test whether the path is the name of a directory. Returns 1 if so, 0 if * not, -1 if it doesn't exist. */ int directoryp(char *path) { struct stat buf; int code = stat(path, &buf); return code == -1 ? -1 : S_ISDIR(buf.st_mode); } int make_path_from_file(char *s, char *t) { char *pos = ""; char *c; /** simply copies the path name from t into s **/ for (c = t + strlen(t); c != s; c--) if (*c == '/') { pos = c; break; } /** Check to see if the path was actually present **/ if (c == t) { /** No Path, so return the pwd **/ return (-1); } /** now just do the copying **/ strncpy(s, t, pos - t); return 1; } /* The functions writeablep() and readablep() determine write and read access of a file designated by its name. The function axiom_has_write_access is a sub-routine of writeablep. The access is determined based on the POSIX semantics; see "Advanced Programming in the UNIX Environement", section 4.5. 1. If the effective user ID of the process is 0 (the superuser), access is allowed. This gives the superuser free rein throughout the entire file system. 2. If the effective user ID of the process equals the owner ID of the file (i.e., the process owns the file), access is allowed if the appropriate user access permission bit is set. [...] 3. If the effective group ID of the process or one of the supplementary group IDs of the process equals the group ID of the file, access is allowed if the appropriate group access permission bit is set. Otherwise, permission is denied. 4. If the appropriate other access permission bit is set, access is allowed. Otherwise, permission is defined. */ /* Return 1 if the process has write access of file as explained above. Otherwise, return 0. */ static inline int axiom_has_write_access(const struct stat* file_info) { int effetive_uid = geteuid(); if (effetive_uid == 0) return 1; if (effetive_uid == file_info->st_uid) return file_info->st_mode & S_IWUSR; #ifdef S_IWGRP if (getegid() == file_info->st_gid) return file_info->st_mode & S_IWGRP; #endif #ifdef S_IWOTH return file_info->st_mode & S_IWOTH; #else return 0; #endif } /* Return -1 if the file designated by PATH is inexistent. 0 if the file exists but wirte access is denied. 1 if the file exists and process has write access. 2 if the file does not exists but process has write has write access to the dirname of path. */ int writeablep(char *path) { struct stat buf; char newpath[100]; int code; code = stat(path, &buf); if (code == -1) { /** The file does not exist, so check to see if the directory is writable *****/ if (make_path_from_file(newpath, path) == -1 || stat(newpath, &buf) == -1) return -1; return 2 * axiom_has_write_access(&buf); } return axiom_has_write_access(&buf); } /* Return -1 if the file designated by PATH is inexistent. 0 if the file exists but process has no read access. 1 if the file exists and read access is granted. */ int readablep(char *path) { struct stat buf; int code; code = stat(path, &buf); if (code == -1) return -1; if (geteuid() == buf.st_uid) return ((buf.st_mode & S_IREAD) != 0); #ifdef S_IRGRP if (getegid() == buf.st_gid) return ((buf.st_mode & S_IRGRP) != 0); #endif #ifdef S_IROTH return ((buf.st_mode & S_IROTH) != 0); #else return 0; #endif } long findString(char *file, char *string) { int nstring, charpos; FILE *fn; char buffer[1024]; if ((fn = fopen(file, "r")) == NULL) return -1; for (charpos = 0, nstring = strlen(string); fgets(buffer, sizeof buffer, fn) != NULL; charpos += strlen(buffer) ) if (!strncmp(buffer, string, nstring)) return charpos; return -1; } int copyEnvValue(char *varName, char *buffer) { char *s; s = getenv(varName); if (s == NULL) return 0; strcpy(buffer, s); return strlen(s); } /* Return 1 if the file descriptor FD, as viewed by the Core Executable, is attached to a terminal. */ int std_stream_is_terminal(int fd) { assert(fd > -1 && fd < 3); #ifdef __WIN32__ DWORD handle; switch (fd) { case 0: handle = STD_INPUT_HANDLE; break; case 1: handle = STD_OUTPUT_HANDLE; break; case 2: handle = STD_ERROR_HANDLE; break; } /* The MS documentation suggests `GetFileType' for determining the nature of the file handle. The return value, in our case, is an over approximation of what we are interested int: Are we dealing with a stream connected to a terminal? The constant FILE_TYPE_CHAR characterises character files; in particular a console terminal, or a printer. There is an undocumented function `VerifyConsoleIoHandle' to deal precisely with the case we are interested in. However, while availale in Wine, it is not available in the MinGW headers. Consequently, we cannot rely on it for the moment. So, we may still get garbage out of this function on MS platforms. */ return GetFileType(GetStdHandle(handle)) == FILE_TYPE_CHAR; #else return isatty(fd); #endif }